CN215253968U

CN215253968U - Prefabricated post connection structure

Info

Publication number: CN215253968U
Application number: CN202121054412.5U
Authority: CN
Inventors: 马云飞; 张猛; 马钊; 陈明; 李然; 田春雨
Original assignee: Sany Construction Technology Co Ltd
Current assignee: Sany Construction Technology Co Ltd
Priority date: 2021-05-17
Filing date: 2021-05-17
Publication date: 2021-12-21
Anticipated expiration: 2031-05-17
Also published as: JP7224393B2; JP2022176858A

Abstract

The present disclosure provides a prefabricated column connection structure, including: prefabricated post, prefabricated post of coupling bar, cast in situ concrete, wherein, prefabricated post includes prefabricated main part, cavity and indulges the muscle, and in the one end of coupling bar extended to the cavity of prefabricated post, cast in situ concrete set up in the cavity. The position of the connecting steel bar corresponds to the position of the longitudinal bar, the lap joint length of the connecting steel bar and the longitudinal bar is L, the lap joint length L is more than or equal to 1.0la and less than or equal to 1.4la, and la is the anchoring length of the tensioned steel bar. The connecting structure does not need the longitudinal ribs of the prefabricated column to preset the connecting parts, simplifies the connecting mode, builds concrete in the cavity to enhance the strength of the prefabricated column and meet the stress requirement of the prefabricated column, and simultaneously realizes the connection of the prefabricated column. The connecting structure saves the connecting cost and the construction time.

Description

Prefabricated post connection structure

Technical Field

The utility model relates to an assembly type structure field especially relates to prefabricated post connection structure.

Background

The fabricated building is a building which is fabricated by transferring a large amount of field operation work in the traditional construction mode to a factory, processing and manufacturing building components (such as floor slabs, walls, beams, columns and the like) in the factory, transporting the building components to a building construction site, and assembling and installing the building components on the site in a reliable connection mode. The building has the advantages of high construction speed, small restriction by climatic conditions, labor saving and building quality improvement.

At present, a frame structure system mainly comprising solid prefabricated columns has a plurality of problems and difficulties, and the solid prefabricated columns are large in size, difficult to hoist on site and inconvenient to transport due to the fact that components of the solid prefabricated columns are heavy. Mechanical connection is usually adopted between two prefabricated columns and between the column and the foundation. The mechanical connection will result in the prefabricated column having to extend the longitudinal ribs, to form the mechanical connection beforehand and to require a high degree of precision in the connection process. Therefore, the frame structure system mainly based on the solid prefabricated columns has low building efficiency, long construction period, high cost and difficult quality guarantee due to the factors.

SUMMERY OF THE UTILITY MODEL

In order to solve the technical problem, the present disclosure provides a prefabricated column connection structure.

According to this disclosure provides a prefabricated post connection structure, includes:

the prefabricated column comprises a prefabricated main body, a cavity and longitudinal ribs;

one end of the connecting steel bar extends into the cavity of the prefabricated column;

cast-in-place concrete disposed within the cavity;

the steel bar tensioning device is characterized in that the position of the connecting steel bar corresponds to the position of the longitudinal bar, the lap joint length of the connecting steel bar and the longitudinal bar is L, the lap joint length L is more than or equal to 1.0la and less than or equal to 1.4la, and la is the anchoring length of the tensioned steel bar.

According to at least one embodiment of the present disclosure, a distance between the connecting rebar and the corresponding longitudinal rebar is a, a ranging from 0mm to dmm, where d is a diameter of the connecting rebar.

According to at least one embodiment of the present disclosure, longitudinal ends of the longitudinal ribs are disposed within the prefabricated body.

The utility model discloses technical scheme has following advantage:

1. the utility model provides a prefabricated post with cavity through setting up the cavity in will prefabricating the post, can reduce the weight of prefabricated post, and is more convenient in aspects such as prefabricated post transportation, hoist and mount like this, in addition, owing to indulge the tip that the muscle does not stretch out prefabricated main part, this kind of figurative prefabricated post tip structure is neat, convenient production, and makes things convenient for stack and transportation promptly.

2. The utility model provides a prefabricated post is lap joint with coupling bar's connected mode, promptly, prefabricated post indulges muscle and coupling bar direct or indirect overlap joint, and the overlap joint position need not use other mechanical connecting piece in the cavity of prefabricated post completely, has reduced the connecting cost of prefabricated post. In addition, the cross section of the cavity is far larger than the diameter of the connecting steel bar, and the precision required by lapping is far smaller than that required by mechanical connection, so that the lapping connection mode is lower in cost and simpler and more convenient to connect.

3. The utility model provides a prefabricated post and splice bar's overlap joint length L because in the technique of component connection formation node, although longer overlap joint length can satisfy the atress requirement of structure, but can greatly increased construction cost, also can cause the waste of steel in addition. On the contrary, the smaller overlap length can not meet the stress requirement of the structure and can cause irreversible potential safety hazard to the building, so the overlap length is defined in the range of more than or equal to 1.0la and less than or equal to 1.4la, the stress requirement of the node can be met, the building safety is ensured, the cost can be reduced, and the steel waste is reduced, wherein la is the anchoring length of the tensioned steel bar.

Drawings

The accompanying drawings, which are included to provide a further understanding of the disclosure and are incorporated in and constitute a part of this specification, illustrate exemplary embodiments of the disclosure and together with the description serve to explain the principles of the disclosure.

FIG. 1 is a longitudinal cross-sectional cut-away view of one preformed column of the present disclosure;

FIG. 2 is a top view of the precast column shown in FIG. 1;

FIG. 3 is a top view of another precast column of the present disclosure;

FIG. 4 is a schematic view of a prefabricated column connection structure of the present disclosure;

FIG. 5 is a top view of a preformed column attachment structure of FIG. 4;

description of reference numerals:

100-prefabricated columns; 110-a prefabricated body; 120-longitudinal ribs; 130-a cavity; 140-stirrup; 200-connecting reinforcing bar

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Furthermore, the technical features mentioned in the different embodiments of the invention described below can be combined with each other as long as they do not conflict with each other.

As shown in fig. 1, which is a longitudinal cross-sectional cut-away view of one prefabricated column of the present disclosure. The prefabricated column includes a prefabricated body 110, longitudinal ribs 120 and a cavity 130.

The prefabricated body 110 is formed of a concrete preform, and the prefabricated body 110 is a column extending along an axis, and as shown, the prefabricated column is a column extending in a vertical direction, i.e., the column extends in a longitudinal direction. The preform body 110 is provided with a cavity 130 along an axial direction. The prefabricated body 110 is wrapped with at least longitudinal ribs 120 extending along the same axis.

The longitudinal bars 120 may be reinforcing bars. The longitudinal ribs 120 extend along the extending direction of the prefabricated body 110. The plurality of longitudinal ribs 120 are arranged along the circumference of the prefabricated body 110 at a designed interval distance, as shown in fig. 2, and fig. 2 is a top view of the prefabricated column shown in fig. 1.

The longitudinal ribs 120 are wrapped in the prefabricated body 110 and are wrapped by concrete, and through the wrapping of the concrete, the longitudinal ribs can enhance the tension or compression capacity of the concrete, so that the stress capacity of the prefabricated column is enhanced.

The outer contour of the prefabricated body 110 is not limited herein, and may be designed into different shapes according to the requirement, for example, a cylinder shape with a rectangular or circular cross section of the outer contour is usually adopted.

Preferably, the preformed post 100 further includes a cavity 130 within the preformed body 110. The cavity of the prefabricated column 100 shown in fig. 1 is a cavity penetrating in the extending direction of the prefabricated column. The purpose of the reserved cavity 130 is to reduce the prefabricated weight of the prefabricated column 100, and facilitate production, transportation and hoisting. On the other hand, the reserved cavity 130 is used as a connecting part, concrete and connecting steel bars are poured in the cavity, and connection with other building units or building components is achieved, so that other mechanical connecting pieces can be omitted, the overall cost of the building is reduced, in addition, the connecting part formed by the cast-in-place concrete and the connecting steel bars is organically combined with the prefabricated part, and the structure is safer.

In another embodiment, as can be seen from fig. 2, the horizontal sectional area of the cavity 130 is much larger than the horizontal sectional area of the reinforcing steel bars, so that more connecting reinforcing steel bars and connecting reinforcing steel bars in more forms can be arranged in the cavity, the insertion and adjustment of the connecting reinforcing steel bars are facilitated, the connection with the connecting reinforcing steel bars can be realized without particularly precise positioning, the construction is facilitated, and the construction period is shortened.

In another embodiment, the cavity 130 may be a plurality of cavities, each cavity corresponding to a single connecting bar or only a few connecting bars, and the cavities are not connected to each other, so that the connecting bars can be pre-positioned to avoid mutual interference of the bars in the same cavity.

As shown in fig. 1, the prefabricated column 100 has longitudinal ends of the longitudinal ribs 120 disposed in the prefabricated body 110 without protruding from the longitudinal ends of the prefabricated body in this direction. The prefabricated column is a neat end part from the outer contour, and the prefabricated column without ribs does not need to be provided with a perforated end mould in the production process, so that the slurry leakage problem of the perforated mould is also avoided. In addition, the prefabricated columns without ribs are convenient to stack and transport.

Such as prefabricated column 100 shown in fig. 1, which may further include stirrups 140. The stirrups 140 are provided at intervals along the longitudinal direction of the prefabricated column 100. As shown in fig. 2, the stirrup 140 surrounds all the longitudinal ribs 120, and forms a restraint for the longitudinal ribs 120.

In one embodiment, as shown in FIG. 2, the outer diameter surface of the longitudinal ribs 120 is spaced a distance B from the inner wall surface of the cavity 130. When B is 0mm, the longitudinal ribs 120 are just exposed in the cavity 130, as shown in fig. 3, and the longitudinal ribs of the prefabricated column in this form can be overlapped with the connecting bars inserted into the cavity without a gap. When the value of B is greater than 0, the longitudinal ribs 120 are wrapped with concrete on the inner wall side of the cavity, and the thickness of the concrete may be 10mm, 15mm, 20mm, 30mm, 40mm, or the like.

In addition, the value of B may also be related to the diameter of the connecting bar, and the value of B is set to be an integral multiple of the distance of the diameter of the connecting bar, for example, 20mm when the diameter of the connecting bar is 20 mm. Like this, go deep into the cavity with the coupling bar, only need with the coupling bar near inside the cavity can guarantee the coupling bar and indulge the distance between the muscle, need not other location.

Fig. 4 is a schematic view of a prefabricated pillar attaching structure, as shown in fig. 4. In fig. 4, a connecting bar 200 is provided in the prefabricated column. The distance between the connecting reinforcement 200 and the longitudinal bar 120 is a. The lap length of the connecting steel bar 200 and the longitudinal bar 120 is L, that is, the overlapping length of the connecting steel bar and the longitudinal bar in the extending direction of the prefabricated column is the lap length.

The connecting reinforcement 200 may be a reinforcement extending from a building foundation, a reinforcement extending from other building components, or a reinforcement connecting two prefabricated columns. The purpose is to connect the prefabricated columns with other building units or building elements. Fig. 5 shows a top view of a prefabricated column with connecting rebars. As can be seen in fig. 5, the connecting reinforcement 200 is disposed within the cavity 130.

In one embodiment, the connecting bars are positioned against the inner walls of the cavity for ease of installation and positioning.

In one embodiment, the connecting bars 200 may be provided in plural numbers, the number of the connecting bars being the same as the number of the longitudinal bars. For example, if there are 12 longitudinal bars, there are 12 connecting bars, so that each longitudinal bar corresponds to each connecting bar.

In one embodiment, the position of the coupling bar 200 corresponds to the position of the longitudinal bar 120. That is, the shape surrounded by the connecting reinforcement and the longitudinal reinforcement is the same, or the position of the connecting reinforcement and the position of the longitudinal reinforcement are the same in azimuth.

In one embodiment, the number of connecting bars may be greater than the number of longitudinal bars in order to enhance the strength of the connection.

In one embodiment, the number of connecting bars may be less than the number of longitudinal bars. Because cavity inner wall space is less, the job site sets up the arrangement of the more connecting reinforcement of being not convenient for reinforcing bar, consequently can adopt the great connecting reinforcement of diameter and reduce the quantity of connecting reinforcement.

After the connecting steel bars are arranged in the cavity, concrete is poured in the cavity, and after the concrete in the cavity is solidified, the connecting steel bars are fixed in the cavity to realize the connection of the connecting steel bars and the prefabricated column, so that the connection of the prefabricated column and other building monomers or building components is realized.

The connection mode is lap joint, the longitudinal bars in the column and the connecting steel bars outside the column are lapped for a certain length, and under the constraint of concrete, the force transmission between the two steel bars is realized without adding a mechanical connecting piece. The connection mode is simple and convenient, and the cost is low.

In the calculation of the building field, the anchoring length of the tension steel bar refers to the length required for transmitting the force borne by the stressed steel bar to the concrete through the bonding of the concrete and the steel bar, and the length is used for bearing the load borne by the upper part. The length of the tendon anchor is defined as la. And la is related to concrete strength, kind of reinforcing steel bar, diameter of reinforcing steel bar. However, the length of the lap joint that can effectively transmit the force between the reinforcing bars is not defined for the lap joint manner.

This is disclosed has done experimental study to overlap joint length, guarantees to satisfy the atress transmission between the reinforcing bar effectively, promptly, can satisfy building atress demand and structural safety, also can minimize connecting reinforcement's length as far as possible, has optimized overlap joint length L.

The main research parameters include lap joint length, concrete strength, steel bar diameter, lap joint spacing and hoop ratio, and the design parameters of the test pieces are listed in table 1-1, wherein 3 test pieces are arranged in each group, and 19 test pieces and 57 test pieces are counted.

Tables 1-1 test piece design parameters

In the table, SC represents a prefabricated test piece and a test piece with a longitudinal bar clear distance of 0 overlapped with each other, SN represents a prefabricated test piece and a test piece with a longitudinal bar clear distance of steel bar diameter d overlapped with each other, SXC represents a test piece with a longitudinal bar clear distance of 0 cast-in-place concrete and overlapped with each other, SXN represents a test piece with a longitudinal bar clear distance of steel bar diameter d cast-in-place concrete and overlapped with each other, and SX represents a test piece with a longitudinal bar clear distance of steel bar diameter d cast-in-place concrete and no steel bar overlapped with each other.

The test piece adopts HRB400 steel bars, and the strength measured value of the steel bars with various diameters is shown in the table 1-2.

TABLE 1-2 mechanical Properties of reinforcing bars

The test piece concrete design strength grades are C40 and C60. 2 groups of concrete with the size of 100 multiplied by 100mm are reserved according to the pouring batch of the concrete at different parts³The compressive strength of the concrete cubic test block is measured after the test piece and the test piece are cured under the same condition, and the converted compressive strength of each batch of concrete standard cubic test block and the concrete strength of each test piece obtained after weighted average according to the cross section area of the test piece are shown in tables 1-3.

TABLE 1-3 cubic concrete compressive strength

The failure modes and the bearing capacity of the test pieces are summarized in tables 1-4. The steel bar slippage happens when the load is about to reach the ultimate tensile strength of the steel bar when the test piece with the lap joint length of less than 1.0la is designed, and the steel bar slippage does not happen until the steel bar is broken when the test piece with the lap joint length of more than or equal to 1.0la is designed. Therefore, the bearing capacity is basically determined by the tensile bearing capacity of the steel bars, namely the bearing capacity level of a test piece with the same steel bar diameter is equivalent and is close to the sum of the ultimate bearing capacities of the two steel bars (412.5 kN for a C20 steel bar test piece, 656.3kN for a C25 steel bar test piece and 762.5kN for a C28 steel bar test piece).

Table 1-4 each group of test pieces destruction shape and bearing capacity

Through the experimental study to prefabricated post connection structure, the reinforcing bar overlap joint structure passes the difference of power performance and failure mode with traditional cast in situ concrete post in this reinforcing bar overlap joint structure, and the influence of principal parameter to the overlap joint performance has then given design and structure suggestion. The specific conclusions are summarized as follows:

(1) the failure mode of each group of test pieces by adopting steel bar lapping is as follows: under the action of axial tension, the whole test piece is in a tensioned state, concrete at the position of a stirrup at the top of a lap joint area is horizontally cracked, a longitudinal steel bar is up to yield, the test piece with the lap joint length less than 1.0la is designed to generate steel bar slippage damage when the load is close to the ultimate tensile bearing capacity of the steel bar, the test piece with the lap joint length more than or equal to 1.0la is designed to mainly take the steel bar breakage as a damage sign, and the bearing capacity is basically equal to the ultimate tensile bearing capacity of the steel bar;

(2) the existence of new and old concrete interfaces and the clear distance (within 1.0 d) of the lapped steel bars have no obvious influence on the failure mode and the bearing capacity of the test piece;

(3) the free end of the lapped reinforcing steel bar is not slipped, and the lapped reinforcing steel bar is anchored to the lapped reinforcing steel bar of new and old concrete, so that the lapped reinforcing steel bar can effectively transfer force on the premise that the structure requirement is met and the lapping length is more than or equal to 1.0 la.

In the description herein, reference to the description of the terms "one embodiment/mode," "some embodiments/modes," "example," "specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment/mode or example is included in at least one embodiment/mode or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to be the same embodiment/mode or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments/modes or examples. Furthermore, the various embodiments/aspects or examples and features of the various embodiments/aspects or examples described in this specification can be combined and combined by one skilled in the art without conflicting therewith.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present application, "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

It will be understood by those skilled in the art that the foregoing embodiments are merely for clarity of illustration of the disclosure and are not intended to limit the scope of the disclosure. Other variations or modifications may occur to those skilled in the art, based on the foregoing disclosure, and are still within the scope of the present disclosure.

Claims

1. A prefabricated pillar connecting structure comprising:

cast-in-place concrete disposed within the cavity;

2. A prefabricated column connecting structure according to claim 1, wherein a distance between said connecting reinforcement and said corresponding longitudinal bar is a, which is in the range of 0mm-dmm, where d is a diameter of said connecting reinforcement.

3. The prefabricated pillar connecting structure according to claim 1, wherein longitudinal ends of said longitudinal beads are provided in the prefabricated body.

4. The prefabricated pillar connecting structure according to claim 1, wherein longitudinal ends of said longitudinal beads are provided in the prefabricated body.